Hi, really, I can share one Hconnection for the whole application. It's done by design. I have several servlets. Each servlet has 1-2 controllers working with hbase internally (put/get/e.t.c) Right now I don't see any reason to refactor code and share single HConnection for all controllers in servlets.
2015-02-13 6:56 GMT+03:00 David chen <c77...@163.com>: > Hi Serega, > I am very interesting in the reason why per application need to create 5 > instead of only one HConnection instances during servlet initialization? > > > > > > > > > At 2015-02-04 01:01:38, "Serega Sheypak" <serega.shey...@gmail.com> wrote: > >Hi, guys from group helped me a lot. I did solve pretty the same problem > >(CRUD web-app) > > > >1. Use single instance of HConnection per application. > >2. Instantiate it once. > >3. create HTable instance for each CRUD operation and safely close it > >(try-catch-finally). Use the same HConnection to create any HTable for > CRUD > >operation. > >4. DO NOT close HConnection after CRUD operation > > > >I have logic controllers which get HConnection injection in > >HttpServlet.init method. > >So I have 5 HConnection instances per application created during servlet > >initialization > > > > > >2015-02-03 18:12 GMT+03:00 Ted Yu <yuzhih...@gmail.com>: > > > >> Please see '61.1. Cluster Connections' under > >> http://hbase.apache.org/book.html#architecture.client > >> > >> Cheers > >> > >> On Tue, Feb 3, 2015 at 6:47 AM, sleimanjneidi <jneidi.slei...@gmail.com > > > >> wrote: > >> > >> > Hi all, > >> > I am using hbase-0.98.1-cdh5.1.4 client and I am a bit confused by the > >> > documentation of HConnection. The document says the following: > >> > > >> > HConnection instances can be shared. Sharing is usually what you want > >> > because rather than each HConnection instance having to do its own > >> > discovery of regions out on the cluster, instead, all clients get to > >> share > >> > the one cache of locations. HConnectionManager does the sharing for > you > >> if > >> > you go by it getting connections. Sharing makes cleanup of > HConnections > >> > awkward. . > >> > > >> > So now I have a simple question: Can I share the same HConnection > >> instance > >> > in my entire application? > >> > And write some magic code to know when to close or never close at all? > >> > Or I have to create an instance and close it every time I do a CRUD > >> > operation ? > >> > > >> > Many thanks > >> > > >> > > >> > > >> >
